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This conditions :
"BETWEEN 0 AND 30" return the results thar are >0 and <30, and other results that have in the field chars (like "No payment"). I can't change the table structure because the app. is very big. I need a work around.

Do you know haw I can make this query to work ?

If I search "BETWEEN 0 AND 30" it will give me only the results that have the 'notice_period' BETWEEN 0 AND 30 and not the rows that have other text in it ?